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Unit 5
AP Biology Unit 5 Vocabulary- Hunter
| Term | Definition |
|---|---|
| Chromosomes | A structure found inside the nucleus of a cell that is made up of proteins and DNA organized into genes. Each cell normally contains 23 pairs of.... |
| Daughter Cell | Cells that result from the division of a single parent cell. They are produced by the division processes of mitosis and meiosis. |
| Diploid (2n) | A cell that contain two copies of each chromosome. The total number of chromosomes in cells is described as 2n. |
| Gamete | An organism's reproductive cells. They are also referred to as sex cells. They include sperm and eggs. |
| Haploid (1n) | The condition of a cell having a one set of chromosomes. |
| Meiosis | The process of cell division that results in the production of a haploid “daughter” cell with a haploid chromosomal number of a diploid “parent” (“original”) cell. |
| Chromatid | One of two identical halves of a replicated chromosome that allow cells to store two copies of their information in preparation for cell division. This is vital to ensure that daughter cells are healthy and fully functional. |
| Crossing Over | The swapping of genetic material that occurs in the germ line. During the formation of egg and sperm cells, also known as meiosis, paired chromosomes from each parent align so that similar DNA sequences from the paired chromosomes cross over one another. |
| Fertilization | The process by which male and female gametes are fused together, initiating the development of a new organism (sperm + egg= embryo). |
| Homologous Chromosomes | Two pieces of DNA within a diploid organism which carry the same genes, one from each parental source. In simpler terms, both of your parents provide a complete genome. Each parent provides the same 23 chromosomes, which encode the same genes. |
| Sexual Reproduction | The combination of (usually haploid, or having a single set of unpaired chromosomes) reproductive cells from two individuals to form a third (usually diploid, or having a pair of each type of chromosome) unique offspring. |
| Allele | One of a pair of genes that appear at a particular location on a particular chromosome and control the same characteristic, such as blood type or color blindness. |
| Conserved | A base sequence in a DNA molecule (or an amino acid sequence in a protein) that has remained relatively unchanged throughout evolution. |
| Genotype | The collection of genes responsible for the various genetic traits of a given organism. The combination of the two, and which one is dominant, determines what trait the allele will express. |
| Law of Independent Assortment | The principle, originated by Gregor Mendel, stating that when two or more characteristics are inherited, individual hereditary factors assort independently during gamete production, giving different traits an equal opportunity of occurring together. |
| Law of Segregation | The principle, originated by Gregor Mendel, stating that during the production of gametes the two copies of each hereditary factor segregate so that offspring acquire one factor from each parent. |
| Phenotype | All the observable characteristics of an organism that result from the interaction of its genotype (total genetic inheritance) with the environment. Examples of observable characteristics include behavior, biochemical properties, color, shape, and size. |
| Trait | A specific characteristic of an organism that can be determined by genes or the environment, or more commonly by interactions between them. |
| Zygote | Fertilized egg cell that results from the union of a female gamete (egg, or ovum) with a male gamete (sperm). |
| Genetic Linkage | The way in which two genes that are located close to each other on a chromosome are often inherited together. |
| Sex-Linked Trait | A trait in which a gene is located on a sex chromosome. In humans, the term generally refers to traits that are influenced by genes on the X chromosome. This is because the X chromosome is large and contains many more genes than the smaller Y chromosome. |
| Nondisjunction | The failure of the chromosomes to separate, which produces daughter cells with abnormal numbers of chromosomes |